ABSTRACT
In a xerographic copying machine and similar applications, the object and image is fixed and the lens is allowed to move to obtain various magnifications. Such a copy lens is shown (high-magnification position) in Figure 37.1a. The aperture stop (surface 10) is just to the left of the next to the last lens. It was designed to cover an image size of 13.9 diagonal, corresponding to standard 8.5 × 11 in. paper. Object to image distance is fixed at 54.134 in. Prescription data for this lens is given in Table 37.1a. The variable spacing and distortion data is given in Table 37.1b. Xerographic zoom (a) layout, (b) MTF plots. https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781315222295/bd2ad0d9-a48e-40ac-8986-c51474069cbd/content/fig37_1.tif"/> Xerographic Zoom Copy Lens (High Magnification Position)
Surface
Radius
Thickness
Material
Diameter
0
0.0000
21.2744
11.120
1
8.4626
0.3154
N-SK16
4.560
2
47.0276
0.0200
4.560
3
8.9304
0.3228
N-SK16
4.360
4
0.0000
1.8457
4.360
5
−21.7334
0.1933
N-SK16
2.160
6
−3.6312
0.2381
LF5
2.160
7
55.5291
0.1612
1.880
8
−5.9960
0.1544
LF5
1.780
9
5.2889
0.8885
1.640
10
Stop
0.0372
1.051
11
99.3279
0.2502
N-SK16
1.300
12
0.0000
0.8984
1.300
13
40.0443
0.3333
N-SK16
2.220
14
−5.1653
27.2012
2.220
15
0.0000
0.0000
13.905
Variable Spacings and Distortion vs. MagnificationMag
T(0)
T(4)
T(9)
T(14)
Distortion %
0.800
27.273
1.7890
0.9394
21.208
0.39
0.927
25.424
1.7463
0.8395
23.200
0.33
1.077
23.399
1.7640
0.8238
25.223
0.23
1.250
21.274
1.8457
0.8885
27.201
0.10
